We have an entry in the A to Z for A&E.
We had a query recently about whether this should be "emergency department (ED)".
Some years ago a policy decision was made to use "emergency department" rather than "A&E" and a lot of hospitals have changed the name of their dept to "emergency department". (See this old Guardian article about the rebranding in 2003.)
However, from our user research, we find that "emergency department" is not well understood. People tend to think it is the American version. Clinicians and some hospitals use the term but patients generally use and understand "A&E".
Google Trends supports the term A&E.

We have an entry in the A to Z for A&E.
We had a query recently about whether this should be "emergency department (ED)".
Some years ago a policy decision was made to use "emergency department" rather than "A&E" and a lot of hospitals have changed the name of their dept to "emergency department". (See this old Guardian article about the rebranding in 2003.)
However, from our user research, we find that "emergency department" is not well understood. People tend to think it is the American version. Clinicians and some hospitals use the term but patients generally use and understand "A&E".
Google Trends supports the term A&E.